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A few of Sir Winston’s other books had been digitised before, including his history of World War II. However, they had only been available in North America.

Arthur Klebanoff , RosettaBooks’ chief executive, said that Churchill's writing was made timeless because of its sheer quality.

He said: “There are only two American figures who have done something comparable, Teddy Roosevelt who wrote 50 books and Richard Nixon who wrote around 10.

“It's wildly unusual to have a world leader who is also a writer, especially when they were such an important figure for 60 years.

“And Churchill was an extraordinary writer. You could open one of his books at a random chapter and read it aloud and you'll find it's beautifully written.

'”He didn't just win the Nobel Prize for Literature, he won it for a good reason.”

Gordon Wise, of London-based Curtis Brown Group, who represents the Churchill estate, added: “Rosetta made a very strong commitment to the whole project, both in the start-up and for the longer term, with a highly competitive and ambitious package that we felt could not be bettered.”

A different deal has been struck to digitise Churchill's papers currently being held at the Churchill Archive Centre in Cambridge.